<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    function fn(num1, num2) {
      return 'qwer' + 123
      console.log(123)
    }

    var flag = fn(123, 456)  // 579

    console.log(flag)
  </script>
</body>
</html>